Category: JavaScript Answers

Sometimes, we want to save a file on disk in a Chrome extension with JavaScript.

In this article, we’ll look at how to save a file on disk in a Chrome extension with JavaScript.

How to save a file on disk in a Chrome extension with JavaScript?

To save a file on disk in a Chrome extension with JavaScript, we can use the chrome.downloads.download method.

For instance, we write

const url = "https://picsum.photos/200/300";

chrome.downloads.download({ url }, (downloadId) => {
  console.log(downloadId);
});

to call chrome.downloads.download with { url } and a callback that runs when the download starts.

We download the file at the url.

Conclusion

To save a file on disk in a Chrome extension with JavaScript, we can use the chrome.downloads.download method.

Sometimes, we want to run a Node.js script from within another Node.js script with JavaScript.

In this article, we’ll look at how to run a Node.js script from within another Node.js script with JavaScript.

How to run a Node.js script from within another Node.js script with JavaScript?

To run a Node.js script from within another Node.js script with JavaScript, we can use the child_process module’s fork function.

For instance, we write

require("child_process").fork("some_code.js");

to call fork with the path of the script we want to run to run it.

Conclusion

To run a Node.js script from within another Node.js script with JavaScript, we can use the child_process module’s fork function.

Sometimes, we want to listen for resize on div element with JavaScript.

In this article, we’ll look at how to listen for resize on div element with JavaScript.

How to listen for resize on div element with JavaScript?

To listen for resize on div element with JavaScript, we can use the resize observer.

For instance, we write

const resizeObserver = new ResizeObserver((entries) => {
  entries.forEach(console.log);
});
resizeObserver.observe(document.getElementById("ExampleElement"));

to create the resizeObserver object with the ResizeObserver constructor.

We call it with a callback that runs when the element we’re observing is resized.

Then we call observer with the element that we want to watch for resizing for.

Conclusion

To listen for resize on div element with JavaScript, we can use the resize observer.

To get element by ID and set the value with JavaScript, we make sure the element is loaded before we try to set its value.

For instance, we write

<input id="id" type="text" value="" />

to add an input.

Then we write

const setValue = (id, newValue) => {
  const s = document.getElementById(id);
  s.value = newValue;
};

window.onload = () => {
  setValue("id", "Hello there");
};

to call setValue in the window.onload method to make sure the input is loaded before we set the value.

In setValue, we get the element with getElementById.

Then we set its value to newValue.

Sometimes, we want to stop a setTimeout loop with JavaScript.

In this article, we’ll look at how to stop a setTimeout loop with JavaScript.

How to stop a setTimeout loop with JavaScript?

To stop a setTimeout loop with JavaScript, we can call the clearTimeout function.

For instance, we write

let timeOutVar;
const myFunc = (terminator = false) => {
  if (terminator) {
    clearTimeout(timeOutVar);
  } else {
    timeOutVar = setTimeout(myFunc, 1000);
  }
};
myFunc(true);
myFunc(false);

to define the myFunc function.

In it, we call clearTimeout with timeOutVar if terminator is true to stop the timer.

Otherwise, we call setTimeout with myFunc and assign it to timeOutVar.

Then we call myFunc with true to start the timer.

And we call myFunc with false to stop it.

Conclusion

To stop a setTimeout loop with JavaScript, we can call the clearTimeout function.